MATLAB: How to get data points from curve

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Hi,
I am having the velocity data collected every 6 hours interval for 22 days. It is like a linear plot. How to smooth the curve and estimate 24 hours value for 22 days. The hourly values are with in the maximum and minimum interval of the day and follows the curve pattern. Day one data starts form 1:5 and so on.
Please help me to get the data points for every hour in that curve.
Please find the attached file column 2 is velocity. column one is x value please igonore that

Best Answer

data = importdata("Maxminpoints.txt") ; 
t = data(:,1) ; y = data(:,2) ; 
nt = 22*24 ; % number of points if every hour taken for 22 days 
ti = linspace(min(t),max(t),nt) ;  % make time 
yi = spline(t,y,ti) ; % interpolate 
Y = reshape(yi,24,[]) ;   % reshape to each day 
Y_mean = mean(Y) ;  % get average value of each day/ 24 hours
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